Reality shows that’s not always true, witness for instance the death of the irreplaceable technologies Internet Explorer and Flash.
Argue all you want but these vaccines have been taken by hundreds of people with no ill effect already. So for the people in the article the risks are not worse than the people in the trials for the commercial vaccines.
I don’t know about the scarcity of the ingredients in this vaccine but if I was in government I’d have directed an institute to run a report on theoretic safety and then a trial on volunteers. That’s a better option than locking up the population for over a year while we wait for the commercial vaccines.